But children may also be at risk because their bones have yet to reach full density and strength.

They are more common in long, warm summers where populations reach higher densities.

Around age 30, your bones reach their maximum strength and density, known as peak bone mass.

Eventually it would reach a size and density that meant its escape velocity exceeded the speed of light.

At that point, bones have reached their maximum strength and density, known as peak bone mass.

In natural populations the tree reaches very high densities.

Brackish water populations can reach densities up to 200-1000 snails per m2.

They also state that cats can reach high densities when there is a reliable food source without proper sterilization and management.

The brown tree snake population on the island has reached peak densities of greater than 100 snakes per hectare.

It is an invasive species in many countries, where populations of the snail can reach phenomenal densities.